code: def test_remove_maintains_order(self):
      ci = CategoricalIndex(list("abcdda"), categories=list("abcd"))
      result = ci.reorder_categories(["d", "c", "b", "a"], ordered=True)
      tm.assert_index_equal(
          result,
          CategoricalIndex(
              list("abcdda"), categories=list("dcba"), ordered=True
          ),
      )
      result = result.remove_categories(["c"])
      tm.assert_index_equal(
          result,
          CategoricalIndex(
              ["a", "b", np.nan, "d", "d", "a"],
              categories=list("dba"),
              ordered=True,
          ),
      )
  
imports: import numpy
  import pytest
  from pandas._config import using_pyarrow_string_dtype
  from pandas._libs import index
  from pandas._libs.arrays import NDArrayBacked
  import pandas
  from pandas import Categorical, CategoricalDtype
  import pandas._testing
  from pandas.core.indexes.api import CategoricalIndex, Index
label_desc: Use image node_id 5 for calling the TestCategoricalIndex2 obj's underlying member method code with example usage: obj.test_remove_maintains_order() without return types